<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<p th:text="${msg}" style="color: red"></p>
    <h1>登陆</h1>
    <form th:action="@{/login}" method="post">
       用户名 <input type="text" name="username">
        密码 <input type="password" name="password">
        <input type="submit">
    </form>
</body>
</html>